151.L1.Lect14.15.Neur.12.11_13.13.Stu

Of ions in and around neurons the numbers of na and k

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Unformatted text preview: nd neurons, the numbers of Na+ and K+ ions that move during the action potential are relatively small http://outreach.mcb.harvard.edu/animations/actionpotential.swf Campbell Figure 48.11 Nerve cell (neuron) function Nerve 1. Central (CNS) vs. peripheral (PNS) nervous system 2. Structure of a myelinated neuron (very simplified!) 3. Basic function of a neuron - generation of an action potential generation (electrical signal; within neuron) (electrical - uni-directional action potential 4. Saltatory conduction (of action potential) - myelinated neurons: ~150 m/sec - unmyelinated neurons: ~1m/sec 5. Release of neurotransmitter molecules from neuron 5. terminal (chemical signal; neurotransmission) terminal Fig. 43.11-1 Nerve terminal After the axon hillock, voltage-gated Na+ ion channels are mostly engaged in perpetuating the action potential along the axon Campbell Figure 48.12 Cytoplasm in axon hillock changes more than 20mV in a positive direction - due to progressive opening of Na+ channels following dendrite receipt of energy or neurotransmitter stimulus Fig. 43.11-1 After the axon hillock, voltage-gated Na+ ion channels are mostly engaged in perpetuating the action potential along the axon Campbell Figure 48.12 Nerve terminal Fig. 43.11-1 After the axon hillock, voltage-gated Na+ ion channels are mostly engaged in perpetuating the action potential along the axon Campbell Figure 48.12 Nerve terminal Fig. 43.11-4 Fig. 43.11-1 After the axon hillock, voltage-gated Na+ ion channels are mostly engaged in perpetuating the action potential along the axon Campbell Figure 48.12 Nerve terminal Fig. 43.11-4 Fig. 43.11-1 After the axon hillock, voltage-gated Na+ ion channels are mostly engaged in perpetuating the action potential along the axon Campbell Figure 48.12 Nerve cell (neuron) function Nerve 1. Central (CNS) vs. peripheral (PNS) nervous system 2. Structure of a myelinated neuron (very simplified!) 3. Basic function of a neuron - generation of an action potential generation (electrical signal; within neuron) (electrical - uni-directional action potential 4. Saltatory conduction (of action potenti...
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This note was uploaded on 04/02/2014 for the course BIO 151 taught by Professor Grinblat during the Spring '08 term at University of Wisconsin Colleges Online.

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